Needle-sharpening attachment for sewing-machines.



B.F.BLAGHAVE. v v NEEDLE SHARPENING ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED MAY 10. ms.

Patented July 18, 1916.

INVENTOR BY W ATTORfiEY WITNESSES M W,

El TE@ TATES ATENT @FETQE.

BERTHA F. BLAGRAVE, OF SEATTLE, WASHINGTON.

Specification of Letters Patent.

Patented J uly 18, 1916.

Application filed May 10, 1915. Serial No. 26,999.

To all whom it may concern Be it known that I, Bnn'rrm F. BLAGRAVE, a citizen of the United States, and a resident of Seattle, in the county of King and State of \Vashington, have invented certain new and useful Improvements in Needle-Sharpening Attachments for Sewing-Machines, of which the following is a full, true, and exact specification.

My invention relates to needle sharpening attachments for sewing machines and has for its principal object to provide a device which is attachable to the bobbin winding stem of a sewing machine or the like for the purpose of sharpening needles.

Other objects will appear as my invention is more fully explained in the following specification, illustrated in the accompanying drawings and pointed out in the appended claim.

In the drawings, Figure 1 is a side elevation of my device. Fig. 2 is a sectional elevation of same shown on a bobbin winding stem.

Referring more particularly to the drawings, numeral 1 indicates an abrasive wheel through which is inserted a hollow hub 2. The hub 2 is shouldered as at 3 to form a channel for retaining a resilient ring 4. The ends 5 of the hub 2 beyond the shoulders 3 are tapered inwardly except at the very tips 6 which are flared. The ends 5 and tips 6 are each split up into four fingers. The hub is preferably of a spring material so that the fingers have a decided tendency to spring inwardly and thus frictionally grip a bobbin winding stem 7 which projects from a bearing 8 on a sewing machine (not shown). The other end of the stem 7 has the usual pulley 9 attached to it. By means of the adjustable fingers and the resilient ring 4, my device may be shipped onto any standard winding stem even though they be not of a uniform diameter. Both the fingers and the resilient ring assist in frictionally holding and steadying the wheel. The advantages of a device of this general character will be apparent when it is understood that many sewing machine needles become dull or turned slightly on the point, thus rendering them unfit for further use unless resharpened. The usual practice is to throw them away but with my device, they can be economically resharpened and time and expense saved.

While I have shown a particular form of embodiment of my invention, I am aware that many minor changes therein will read ily suggest themselves to others skilled in the art without departing from the spirit and scope of the invention, and I therefore, desire to avoid being limited to the exact form shown and described except as pointed out in the appended claim.

Having described my invention, what I claim as new and desire to protect by Letters Patent, is

In a device of the character described, the combination of an abrasive wheel having a cored center, a hollow hub having a shouldered internal channel secured within the said center, a resilient ring within the said channel, and tapered spring fingers extend ing from either end of the said hub, whereby the hub and wheel may be frictionally held to stems or shafts of varying sizes within the range of the device.

BERTI-IA F. BLAGRAVE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

